No | The cooling system is operational. |
|---|
DIAGNOSIS AND TESTING > ENGINE COOLING > PINPOINT TESTS > PINPOINT
TEST B : PINPOINT TEST
The Engine Overheats
Normal operation and Fault Conditions
The engine cooling system maintains the engine temperature during operation. Correct coolant flow through the engine, radiator and remainder of cooling system passages and components is essential to maintaining a correct engine temperature.
Engine coolant flows primarily from the engine to the radiator circuit and back to the coolant pump. Coolant is sent from the coolant pump through the engine block and cylinder head. A separate circuit from the engine also feeds the heater core with coolant. The coolant pump circulates the coolant. The coolant thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and returns to the coolant pump. When the thermostat is opened, coolant flows through the radiator circuit to transfer engine-generated heat to the outside air.
Engine overheating generally occurs when there is a disruption in the ability to control either coolant flow at the correct rate, the inability to transfer heat from the engine through the coolant (including low coolant) or an inability to transfer engine-generated heat to the outside air through the radiator.
Possible Sources
Low coolant level
External engine coolant leak
Airlock in system
Pressure relief cap installation
Restricted airflow through A/C condenser/radiator
Active grill shutter stuck closed
Internal engine coolant leak
Turbocharger
Coolant condition/concentration
Non-OEM engine enhancement components
Electric cooling fan
CHT sensor
ECT sensor
Radiator
Original technical text and illustrations, formatted as HTML. Follow the engine, transmission, equipment, model and year specified in the source. Import and layout checks do not establish applicability to every 2015–2017 Mustang. About this collection.